joslyn



(No Model.)

E. M. BENTLEY.

UNDERGROUND-ELBGTRIG WAY.

No. 302,378. Patented July 22, 1884.

Mmm ff :2T/TEST@ INVENTo-R. d/J "A Ultim-2n l binarias Partnr @ri-rien.'

EDV/'ARD M. BENTLEY, OF BROOKLYN, NEW YORK.

- UNDERGROUND ELECTRIC WAY.

GPECEEIGATIOBT forming part of Letters Patent No. 302,378, dated July 22, 1884.

Application filed December 15, 1883.

.lo @Zvi lul-"wm :it may concern:

Be itkn own that I, EDWARD M. BENTLEY, a citizen ofthe United States, residing at Brooklyn, New York, have invented certain new and useful Improvements in Underground Electric 'Vays, of which the following is a specification.

My invention consists in a relative arrangement between electric-light wires and singlecircuit wires oi' any other kind by which inductive disturbance is avoided, and in a conduit for containing such wires.

In the accompanying drawings, Figure l is a perspective View of my electric way. Fig. 2 is a top view of a junction-box for giving access to the wires. Figs. 3 and 1,1. are diagrams of the two kinds of electric circuits.

The arrangement ofthe circuits will be better understood by reference to patents granted to Walter Il. Knight and myseli'on'May 1, 1883. The electric-lightavires are run up one side of the conduit and return down the opposite side in substantially the same horizonal plane, and in the central part of the conduit are arranged single-circuit wires in cables, the light-wires being insulated by the material ofthe conduit and the single-circuit wires by independent `insulation applied to each wire of the cable, in

the usual manner. The cables which are in the median plane will, it is evident, be exposed to equal and opposite inductive influences from the light-wires ou either side, while the cables which are out of said plane will be covered over from side to side at intervals, so that the opposing induction will be made equal from each branch of the light-wires. For practical purposes this arrangement is generally sufiicient, although thcl wires in opposite sides of the central cable are at slightly unequal distances from the light-wires, and in the side cables the wires in one section will be a little i'arther from the li ght-wirc than the same wires in the same cable in the next section. This may be adjusted, if necessary, .by giving each cable a half-turn at the end oi' each section, or by having the wires gradually twisted throughout their whole length. The former method -is indicated in Fig. 3 and the latter in Fig. 4:. The conduit for these wires is made of a hard glazed terra-cotta tube, A, or of aporous terracotta tube soaked in asphalt and inclosed in a protecting-jacket of wood, E. Within this is (No model.)

an inner partitioned conduit, B, of glazed or unglazed terra-cotta, made in sections of the same length as A, ,but breaking joints therewith, and provided with dowel-pins d or other means of alignment. On eachside of conduit B are small wooden tubes E, )acked in asphalt C. In construction the ends oil two inner conduit-sections, B and B2, are placed end to end, and then a second outer section, A2, slid over it and cemented to A. The cables and lightwires are drawn into the conduit thus made in any convenient way.

Junction-boxes are placed at frequent intervals, and will be as shown in Fig. 2. D is said junction-box, the cables F being brought into it and covered over, as sho\vn,wl1ile the lightwires L L are placed along the opposite sides of the box aud secured there by suitable insulation, as small wooden troughs with aliquid seal of tar. The wires of cables F are preferably used for telegraphic purposes, and telephone-cables are made as shown in an application of even date herewith, and drawn into any convenient openingY in B.

Vhat I claiml as my invention isl. The combination of an underground conduit, one or more electric-light circuits therein, having their direct and return conductors,

on opposite sides of said conduit, respectively, and one or more independent cables in the conduit, composed each of a number of insulated single-circuit conductors, said cable or cables being placed in the central space of said conduit.

2. The combination of an vunderground conduit, one or more electric-light circuits having direct and return conductors on opposite sides of said conduit, respectively, and independent cables composed each of a number of insulated single circuit conductors, said cables being placed in the central space of the conduit substantially symmetrically with respect to said light circuit or circuits, so as to be subject to opposite inductive influences frointhe respective conductors of the light-circuits.

3. rlhe combination ol' an underground conduit, one or more electric-light circuits therein, having their direct and return conductors on opposite sides of said conduit, respectively, and one or more cables in the conduit, composed each of a number of insulated single- IOO eireuit eonduetors, placed substantially in the medizin plane :Lt right angles to the plane of the electric-light conductors.

4L. The combination of :in underground Conduit, one or more eleetrie-light eireuits therein, lniving` their direet and return eonduetors on opposite sides oi seid conduit, respectively, und one or more Cables in the intervening sli-(tee ofthe conduit, eaeh composed of :L nuinber of insulated single-Circuit Conductors, the lateral Wires of ezteh crible interelnniging posi tions :rt intervals.

5. rlhe Combination of un underground eenduit, one or more electric-light circuits therein, having their direet and return conductors on opposite sides el" said Conduit.respectively, und one or more Cables Composed of a number el' wires in the intervening` space of the Conduit, @eeh eeble having fthalf-turn :Lt intervals.

(3. The eonibinntion o'l'zi conduit divided into seetions,\vith intervening,` junction-boxes, eleetrie-light und other Wires therein, said other wires being insulated independently of their inelosing-eoiuluit, and the light-Wires being bere, but insulsttedby the surroumling Conduit nnlterinl, und ineens et the ljn1ietion-boxes for preventing Contact with the bere lightwires.

7. The combination of an inner and an outer onduit for el eetriewi res, :in intervening spziee between them lfilled .in with plastic nntterinl, electric-light Wires in seid space, und insulated Wires for other purposes in the interior conduit.

S. The ooinbinotionoln conduithwing eleetrie-light wires on opposite sides thereof :ind other wires in the Central pnrt, find :i junctionbox wider than the conduit, the eleetrielight wires at sind ju netion-box being;` bent outn'nrd from the line ofthe conduit.

9. The combination of in! inner und :in outer Conduit, :in inteiwenin` layer oll plastic .ninterial, as nsphziltuin, VLubes ol" insulnting 'nude rial embedded therein7 :ind eleelrielight wi res in seid tubes.

Signed this 15th dey Ol December, 11.85523.

Witnesses:

ICorrection "in letters Patent No. 302,378.

It is hereby certified that in Letters Patent No. 302,378, granted July 22, 1884, upon the application of Edward M. Bentley, of Brooklyn, New York, for an improvement in Underground Electric Ways, errors appear in the printed speciiication requiring correction, as follows: In lines 32 and 67, page l, the word covered should read crossed; and that the Letters Patent should be read with these corrections therein to make it conform to the record of the case in the Patent Oce.

, Signed, countersigned, and sealed this 29th day of July, A. D. 1884.

[SEAL] M. L. JosLYN,

Acting Secretary of the Interior. Countersigned BENJ. BUTTERwoRTH,

Commissioner of Patents.

"Correction lein letters Patent No. 302,378.

p It is hereby certified that in Letters Patent No. 302,378, granted July 22, 1884, upon the application of Edward M. Bentley, of Brooklyn, .N ew York, for an improvement in Underground EleetricWays, errors appear in the printed specioation requiring f correction, as follows: In lines 32 and 67, page l, the Word eovered7 should read crossed; and that the Letters Patent should be read with these corrections therein to make it conform to the record of the ease in the Patent Office. i

Signed, countersigned, and sealed this 29th day of July, A. D. 1884:.V

'f [SEAL] M. L. J OSLYN Acting Secretary of the Interior. .C0untersgned:

BENJ. BUTTERWORTH,

Commissioner of Patents. 

